*{margin: 0;padding: 0}
.main{
    width: 100%;
    height: 500px;
    margin-left: auto;
    margin-right: auto;
    background: url("../images/bg.jpg") repeat fixed ;
    opacity: 0.9;
}
/* .main::before{
    content: "";
    display: table;
    clear: both;
} */
.top{
    height: 50px;
    width: 100%;
    margin-left: auto;
    margin-right: auto;
    position: relative;
}
.top-left{
    margin-top: 50px;
    height: 50px;
    width: 150px;
    line-height: 50px;
    position: absolute; left: 200px;top: 0;
}
.top-left a{
    font-size: 20px;
    color: #666;
    text-decoration: none;
}
.top-right{
    margin-top: 50px;
    height: 50px;
    width: 800px;
    line-height: 50px;
    position: absolute;right:-90px;top: 0;
}
.top-right a{
    font-size: 18px;
    color: #666;
    margin-left: 10px;  
    text-decoration: none;
}
.top-right>a:hover{
    text-decoration: none;
    cursor: pointer;
    color:  #2cb8e2;
    border-bottom: 2px solid  #2cb8e2;
}
.top-left>a:hover{
    text-decoration: none;
    color:  #2cb8e2;
} 

/* nav */
.nav{
    width: 1200px;
    height: 400px;
    border: 1px solid black;
    position: relative;
    margin-left: auto;
    margin-right: auto;
    margin-top: 20px;
}
.nav-left{
    width: 600px;
    height: 400px;
    position: absolute;
}
.nav-right{
    margin-left: 50%;
    width:600px;
    height: 400px;
    border:1px solid #666;
    overflow: hidden;
    position: relative;
}
.nav-right img{
    position: absolute;
}
.nav-right img:nth-of-type(1){
    z-index: 100;
}
button{
    cursor: pointer;
    width:40px;
    height: 70px;
    border:none;
    background:url("../images/icon-slides.png");
    position: absolute;
    z-index: 200;
}
.position-center-y{
    position: absolute;
    top:50%;
    transform: translateY(-50%);
}
.next{
    right:0;
}
.prev{
    background-position-x: -83px;
}
.next{
    background-position-x: -126px;
}
.prev:hover{
    background-position-x: 0;
}
.next:hover{
    background-position-x: -42px;
}
.all-icons{
    position: absolute;
    z-index: 300;
    right:0;
    transform: translateX(-30%);
    bottom: 20px;
}
.all-icons span{
    display: inline-block;
    cursor: pointer;
    margin-right: 5px;
    width:15px;
    height: 15px;
    border:1px solid #fff;
    background-color: rgba(44,44,44,.3);
    border-radius: 50%;
}
.all-icons .active{
    background: #2cb8e2;
}
.about{
    height: 500px;
    margin-left: auto;
    margin-right: auto;
    margin-top: 40px;
    border: 1px solid red;
}
.about-top{
    height: 80px;
    border: 1px soid #D9EFFD;
    background-color:#D9EFFD;
    position: relative;  
}
.about-top .item{
    position: absolute;
    left: 50%;top:50%;
    transform: translate(-50%,-50%);
}
.item span{
    float: left;
    font-size: 20px;
    margin-left: 20px;
    font-weight: bold;
}